/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMCompiler/RigVMAST.h
An abstract syntax tree block expression represents a sequence of child expressions to be executed in order. In C++ a block is represented by the curly braces { expr1, expr2, ...}.
class FRigVMBlockExprAST : public [FRigVMExprAST](API\Plugins\RigVMDeveloper\RigVMCompiler\FRigVMExprAST)